Minor.

Author: pavel-raykov

keystore/storage/file.go

@@ -0,0 +1,29 @@
+package storage
+
+import (
+	"context"
+	"os"
+)
+
+const readWritePerms = os.FileMode(0600)
+
+var _ Storage = &FileStorage{}
+
+// FileStorage implements Storage using a file
+type FileStorage struct {
+	name string
+}
+
+func NewFileStorage(name string) *FileStorage {
+	return &FileStorage{
+		name: name,
+	}
+}
+
+func (f *FileStorage) GetEncryptedKeystore(ctx context.Context) ([]byte, error) {
+	return os.ReadFile(f.name)
+}
+
+func (f *FileStorage) PutEncryptedKeystore(ctx context.Context, encryptedKeystore []byte) error {
+	return os.WriteFile(f.name, encryptedKeystore, readWritePerms)
+}

keystore/storage/file_test.go

@@ -0,0 +1,21 @@
+package storage_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/smartcontractkit/chainlink-common/keystore/storage"
+)
+
+func TestFileStorage(t *testing.T) {
+	t.Parallel()
+	storage := storage.NewFileStorage(filepath.Join(t.TempDir(), "out.txt"))
+	_, err := storage.GetEncryptedKeystore(t.Context())
+	require.ErrorContains(t, err, "no such file or directory")
+	require.NoError(t, storage.PutEncryptedKeystore(t.Context(), []byte("test")))
+	got, err := storage.GetEncryptedKeystore(t.Context())
+	require.NoError(t, err)
+	require.Equal(t, []byte("test"), got)
+}

keystore/storage/memory.go

@@ -5,6 +5,8 @@ import (
 	"sync"
 )
 
+var _ Storage = &MemoryStorage{}
+
 // MemoryStorage implements Storage using in-memory storage
 type MemoryStorage struct {
 	mu   sync.RWMutex

keystore/storage/memory_test.go

@@ -1,17 +1,18 @@
 package storage_test
 
 import (
-	"context"
 	"testing"
 
-	"github.com/smartcontractkit/chainlink-common/keystore/storage"
 	"github.com/stretchr/testify/require"
+
+	"github.com/smartcontractkit/chainlink-common/keystore/storage"
 )
 
 func TestMemoryStorage(t *testing.T) {
+	t.Parallel()
 	storage := storage.NewMemoryStorage()
-	require.NoError(t, storage.PutEncryptedKeystore(context.Background(), []byte("test")))
-	got, err := storage.GetEncryptedKeystore(context.Background())
+	require.NoError(t, storage.PutEncryptedKeystore(t.Context(), []byte("test")))
+	got, err := storage.GetEncryptedKeystore(t.Context())
 	require.NoError(t, err)
 	require.Equal(t, []byte("test"), got)
 }